Collapsible inner shell for molding tapering pipe.



y PATENTED OUT. 1, 1907. ,c. ,L. SIMPSON. GOLLAPSIBLE INNER SHELL FORMOLDINGITAPERING PIPE;

APPLIOAT ION FILED JUNE 29, 1907. w

2 SHEETS-SHEET 1.

HIIIHW.

No. 867,431. V PAIENIED "ocT, 1., 1907.-

I v 0.1,."s1M'Ps0 I v GOLLAPSIBLB INNER SHELIl-FOR MOLDINGTAPERING PIPE.

APPLICATION FILED JUNE 29.1907.

. To all whom it maylconcem:

4, panded shellshowing it expanded position cor-' responding to Fig. l.Fig. 4isasimilar:view of the i .25

' UNITED STATES arana? onnron.

onARLEsL. SIMPSON, or MINNEAPOLIS, MINNnsoTA, ASSIGNOR TO MIRACLEPnnssnn STONE COMPANY, OF MINNEAPOLIS, MINNESOTA, A CORPORATION OF SOUTHDAKOTA.

COLLAPSIBLE INNER SHELL FOR MOLDING TAPERIN 'G PIPE.

no. semei.

Specification of Letters Patent.

Patented Oct. 1, 190-7.

Application filed JuneZQ, 1907. serial No. 381A14.

Be it known that 1, CHARLES L. SIMPSON, a citizen of the United States,residing at Minneapolis, in .the county of Hennepin and State ofMinnesota, have invented new and useful Improvements in CollapsibleInner Shells for Molding Tapering Pipe, of which the following is aspecification, reference being hadto the accompanying drawings, forminga part thereof.

The purpose of this invention is to provide an improved construction ofcollapsible core or inner memher or shell of-a mold for molding ofplastic material,- such as cement concrete'or clay, tapering pipesections such as are required for connecting different sizes-of sewerpipe or drain tile or for forming the top or mouthpieceof a sewercatch-basin or manhole.

It consists of the features of construction shown and described asindicated in the claims.

In the drawings :Figure 1 is an axial section of the inner member of amold embodying this invention, the same being shown at fullyexpandedposition. Fig. 2 is a similarview showing the shell collapsed toits mini: mum dimensions. Fig; 3 is an endview oi the exsame end,showing it atcollapsed or contracted position corresponding to Fig. 2.rig. 5 -is a view similar to 0 Fig. 2 of the opposite end of theshell.Fig. '6 is a view similar" to Fig. 4 of saidopposite end. 1

The shell comprises two series of tapering segmental plates, 1 and 2,the plates-,2, being of the same form as the plates, 1, but alternatingwith the latter lapping outside thereof, so that when the shell isexpanded to cause the lapping plates to come into contact attheir lappededges, outward pressure upon all the sections opposed to the exteriorresistance of the molded material tends to keep the lapped joints closedso as to make a complete inner wall of the mold. Thesegments aredesigned to be sothin that the slight longitudinal shoulders formed onthe inner wall of the molded body by the edges of the outer lappedsegments corresponding to the thickness constitute negligible featuresso far as the utility of the molded pipe is concerned. For collapsingand expanding the mold formed of these segmental plates, there areprovided two travelers, 3 andA, running upon a right-and-left threadedshaft, 5, the travelers being correspondingly apertured and threaded forpenetration at the centerby the shaft, so that being thereon, therotation of the shaft causes the travelers restrained from rotating totravel in opposite directions along the shaft.

Each traveler comprises two series of radial lugs or fingers; 3, 3" and4, 4 the fingers, 3 and 4, being longer than the fingers, 3 and 4",respectively: Th6 series of longer fingers, 3and 4", are connected bylinks, G'and 7, with'kthe inner segments, .1, of the shell, the

links, 6, from the traveler, 3, extending to the upper or narrower end,and the links, 7, from the traveler, 4, extending to the lower or widerend of the respective segments. Thelinks, 6 and 7, from the shorter lugs3 and 4 of the travelers, 3 and 4,- respectively, extend respectively tothe uppcr'and lower ends oitheouter segment plates, 2. A specificpurpose of the construction shown is to cause the shell in collapsing toreduce its wider end to such dimensions as to permit it to be withdrawnfrom the smaller end of the moldedbody or tapering pipe, and thispurpose requires means for collapsing the shall at the wider end morerapidly I than at the narrower end by the rotation of the screw shaft.This is accomplished by making the pitch of the left-hand screw thread,5, which engages the travfeler, 4, greater than that of the screwthreads, 5 which engage the traveler, 3. It ispr eferable, also, inmaking the 'left-handscrew of greatcrpitch, to make it with a doublethread, the right-hand scre'w at the upper end of the shaft being singlethread. The lugs of the traveler which *are connected with the outer setof segwith the inner set, are also offset inwardly along the 'axis ofthe shell from said longer lugs. This causcsa distinct difference in theratioof the length of the lug,- that is, the distance of the link pivotthereon from the axis of the shaft, -to the length ofthe link-connectedwith it, the purpose and effect of which is, as will be understood bycomparison ofthe expanded and collapsed views, to cause the inner seriesof segment plates to withdraw inward from the outer in the collapsingaction. This is desirable for-the purpose of easing the collapsing andexpanding action, because it preyents the plates from holding each otherfrictionally by their contact in th'e'expanding' and collapsingmovement. Inor'der to cause the links, 7 and 7, which brace the wideren'dsof thesegment plates to perform that function most effectivelyand'in such manner as to most perfectly prevent thecollapse orflattening of the plates in the pressure, of the molded material asit istarriped iii-to the mold, I prefer to fork the endsfof thelinks,

:7, which connect the inner series of segment plates, 1, giving saidlinks two p'ivotal connections, 7 and- 7 with their respective plates-Thelinks, 7, which connect with the' outer series of plates}, are notthus ments, 2, which areshorter than those which connect forked but areconnected with-their respectiveplates by a single pivot, 7i at themiddle of the widt Moi. the plate. By properlyspreading' thefork'arms'of the forked links',-this arrangement gives threeequallyspaced hearings or bracing points for'ea'ch two consecu- 'tivc links,thus distributing the bracing uniformly throughout the circumference;and the inner plates having the double bracingby their edges lappedinside the outer plates transmit the resistance of the braces to saidouter plates at the edges supplementing the bracing which they receiveat the middle from their own links. In order to prevent the links frombeing folded l'iack past the point of greatest extension after themovement of the travelers has caused them to be thus extended, thetravelersare provided'with shoulders, 6, which stop the ends of thelinks substantially at the point of greatest extension, said shouldersand the cooperating ends'oi the links being shaped so as not tointerfere with the folding of the links in direction for the collapse ofthe shell,'that is, for the movement of the travelers inward irom theends of the screw i claim: v

1. An lnn'er'me'mbor ofa pipe'mold'consisting of an expansible andcollapsible shell comprising two sets ofseg mentai plaies,'-'the platesof" one 'set heingrlapped outside those 'of'the other set; an'axialshaft and two travelers I'nonnted' for-movement there-along; links-fromeach traveler to'the plates of the two sets, the'lln'ks for the outer--.lapped set-being pivoted to the traveler-shearer the axis of'theirp'ivotalconnectiolr tothe traveler alanine links" forthe other set.

3. An lnner member of a plp'e'mold consisting of an ex pansihle andcollapsible shell comprising two sets of segmental plates, the plates ofoneset' being lapped outside these of'the other set; an-axial screwshaft oppositely threadetl'at its opposite end portions;two'travelersen' gag ed with said oppositely-threaded portionsrespectively links which connect the tr y eiers" respectively to'thizopposite'ends of thsegment plates, the'links for the outerlapped platesbeingpivoted tothe travelers at transverse.

planes inward from the planes at which the links for the other set arepivoted. all the links from each vspider liilllLJ pivoted iothesegnn-nis at substantially the same lranverse plane.

4. The inner member of a pipe lnold consisting' of an ex pansihle andCollapsible shell comprising segmental plains: an axial screw shafthavim, its opposite end portions oppositely threaded; two travelersengaged with said oppo sitely threaded portions respectively fornon-relative travel 'alorn, the shaft by the rotation thereof; linksonnee-ting the travelers respectively with Opposite ends of the plates,the shaft having its thread for engagement with one oi thetravelers oigreater pitch than that for ellgzllg'p- 'ment with the other.

5. In an inner member of a pipe mold consisting of an expansible andcollapsible shell comprising two sets of son mental plates; the platesofl one set being, lapped outs-idithose of the other set; an axial screwshaft opposit ly threaded at its opposite end 1 portions andilJH'ill'l'h mounted rcspeutively on said-oppositely threaded portionfor non-rotative travei therealong by the rotation of the shaft; linksfrom therespective travelers to opposiie ends of the plates, the shafthaving its thread for engaaenn-ni with one of the travelers of greaterpitch than illo other. and means for rotatlng'the shaft in thetravelers.

G. 'An'inner member of a pipe mold consistin of an expansibl andcollapsible shell comprising: two sets of tar peredsetrmenh'rl plates,the plates of one set being lap ed outside those of the'other set; anaxial screw shaft having its opposite end portions oppositely threaded;two lra\'-' elers mounted on said shaft for the non-relative movementthere-along by the rotation of the shaft linksconnecting the travelersrespectively with opposite ends of llnplates, the links for the'outer-lapped set helm, longer relatively to the distance from the axis0!? their pivotal connection wlninie' travelers'thnn the links of theooli-lset, the shaft having its thread for engagement with one of thetravelers of greater pitch than that for env'agelnent of the othertraveler, and means fonroiatin the shaft.

In testimony whereof, I have hereunto set my hand, in the presence oftwo witnesses, at )lilllltdpolis, .\linn., this 24 'day of June, 1907.

CHARLES I. SI l'SUN.

In the'presence 0f A. M.- Monsnrinn, W. I. Jenkins.

